Measurement of fs/fu Variation with Proton-Proton Collision Energy and B-Meson Kinematics
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PhysRevLett.124.122002.pdf
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Author(s)
LHCb Collaboration
Boettcher, T.
Craik, D. C.
Weisser, Constantin
Williams, M.
Alternative Title
Measurement of f[subscript s]/f[subscript u] Variation with Proton-Proton Collision Energy and B-Meson Kinematics
Date Issued
March 2020
Journal
Physical Review Letters
Publisher
American Physical Society
Citation
LHCb Collaboration (Aaij, R., et al.), "Measurement of fs/fu Variation with Proton-Proton Collision Energy and B-Meson Kinematics." Physical Review Letters 124 (Mar. 2020): no. 122002 doi 10.1103/PhysRevLett.124.122002 ©2020 Author(s)
Version
Final published version
Abstract
The ratio of the B[superscript 0 over subscript s] and B[superscript +] fragmentation fractions f[subscript s] and f[subscript u] is studied with B[superscript 0 over subscript s]→J/ψϕ and B[superscript +]→J/ψK[superscript +] decays using data collected by the LHCb experiment in proton-proton collisions at 7, 8, and 13 TeV center-of-mass energies. The analysis is performed in bins of B-meson momentum, longitudinal momentum, transverse momentum, pseudorapidity, and rapidity. The fragmentation-fraction ratio f[subscript s]/f[subscript u] is observed to depend on the B-meson transverse momentum with a significance of 6.0σ. This dependency is driven by the 13 TeV sample (8.7σ), while the results for the other collision energies are not significant when considered separately. Furthermore, the results show a 4.8σ evidence for an increase of f[subscript s]/f[subscript u] as a function of collision energy.
MIT Department
Massachusetts Institute of Technology. Department of Physics
Terms of Use
Creative Commons Attribution 3.0 unported license
Persistent DSpace Link
DOI of Published Version
https://doi.org/10.1103/PhysRevLett.124.122002
